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首页> 美国卫生研究院文献>Materials >Laboratory and Numerical Analysis of Steel Cold-Formed Sigma Beams Retrofitted by Bonded CFRP Tapes—Extended Research
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Laboratory and Numerical Analysis of Steel Cold-Formed Sigma Beams Retrofitted by Bonded CFRP Tapes—Extended Research

机译：钢筋冷成型Sigma梁的实验室和数值分析通过粘结CFRP胶带延长研究改造

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摘要

The presented research is a part of a broader study of strengthening methods closely associated with cold-formed sigma steel beams with tapes made of Carbon Fiber Reinforcement Polymer/Plastic (CFRP). The presented results are a continuation and extension of the tests described in previous work by the authors and refer to high-slenderness thin-walled steel sigma beams subjected to a significant large rotation. The main idea of this expanded study was to identify the effectiveness of CFRP tapes with respect to different locations, namely at a bottom-tensioned or upper-compressed flange. Six beams with a cross-section of an Σ140 × 70 × 2.5 profile by “Blachy Pruszyński” and made of S350GD steel with a span of L = 270 cm were tested in the four-point bending scheme. Two beams, taken as reference, were tested without reinforcement. The remaining beams were reinforced with the use of a 50-mm wide and 1.2-mm thick Sika CarboDur S512 CFRP tape, with two beams reinforced by placing the tape on the upper flange and two with tape located on the bottom flange. The CFRP tape was bonded directly to the beams (by SikaDur®-30 adhesive). Laboratory tests were aimed at determining the impact of the use of composite tapes on the limitation of displacements and deformations of thin-walled structures. In order to perform a precise measurement of displacement, which is, in the case of beams subjected to large rotations, a very difficult issue in itself, the Tritop system and two coupled lenses of the Aramis system were used. Electrofusion strain gauges were used to measure the deformation. In the next step, numerical models of the analyzed beams were developed in the Abaqus program. Good compliance of the results of laboratory tests and numerical analyses was achieved. The obtained results confirm the beneficial effect of the use of tapes (CFRP) on the reduction in displacements and deformations of steel cold-formed elements.
机译：本研究是更广泛研究的加强方法与冷成型的Sigma钢梁密切相关的方法，具有由碳纤维增强聚合物/塑料（CFRP）制成的胶带。所呈现的结果是作者在先前的工作中描述的测试的延续和延长，并参考高纤维薄壁钢Sigma梁，经受显着大的旋转。该扩展研究的主要思想是识别CFRP带相对于不同位置的有效性，即在底部张紧或上压制法兰。通过“BlachyPruszyński”的六个横截面的横截面，并在四点弯曲方案中测试了由S350GD钢制成的跨越L = 270cm的S350GD钢。在没有加强的情况下测试了作为参考的两个光束。使用50毫米宽和1.2毫米厚的Sika Carbodur S512 CFRP胶带加强了剩余的梁，通过将胶带放在上部法兰上的胶带和两个带位于底部法兰上的磁带上，加强了两个梁。将CFRP胶带直接粘合到梁上（通过Sikadur®-30粘合剂）。实验室测试旨在确定使用复合带的影响对薄壁结构的位移和变形的限制。为了执行精确的位移测量，即在经受大旋转的梁的情况下，使用本身的非常困难的问题，使用氚系统和阿拉米斯系统的两个耦合透镜。电熔应变仪用于测量变形。在下一步中，在ABAQUS程序中开发了分析光束的数值模型。实现了实验室测试结果和数值分析的良好遵守。所获得的结果证实了使用磁带（CFRP）对钢冷成形元素的缩小和变形的效果的有益效果。

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